<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=`">
    <title>Document</title>
</head>

<body>
    <script>
        let hero = {
            name: '吕布',
            age: 22,
        }

        function sum(a, b, c) {
            console.log(a, b, c);
            console.log(a + b + c);
            console.log(this);
        }

        sum(2, 4, 6);
        sum.call(hero, 2, 4, 6);
        sum.apply(hero, [2, 4, 6])

        // apply() 作用
        // 1. 调用函数，修改 this 指向
        // 2. 参数必须是数组(伪数组)，数组结构为函数的形参

        console.log('-------------------------------');
        console.log(Math.max(11, 2, 33, 4, 555));
        
        let arr = [11, 2, 33, 4, 555]
        console.log(Math.max(arr));

        // 原函数要求传递多个 number 类型的参数
        // 使用  apply() 之后，传递的参数是一个数组
        console.log(Math.max.apply(Math, arr));
    </script>
</body>

</html>